Wondfo - Pregnancy Test Strips Over 99% Accuracy - Fast and Reliable The value pack of pregnancy test strips is specially designed for customers who are trying to get pregnant naturally. All tests are FDA-approved and over 99% accurate. Our products are extremely easy to use. Simply dip the test in urine for 3 seconds and levels of HCG as low as 25 mIU/ml can be detected within 3-5 minutes.